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In this photo you can see one of the most dangerous fishes in
the Red Sea: the Lionfish (pterois radiata). The red vertical strips are nothing else than warnings signals. They
are saying do not touch me. If you ever see a fish similar to this
one anywhere in the world, do not get close to it, their spines are
extremely poisonous (in some cases even mortal).

Lionfish use their venom for defense
only, never to get food. If a diver accidentally steps on them, the
effect is immediate: the victim is unable to move his or her arms
or legs due to the swelling. Other symptoms include nausea, breathing
problems, paralysis, delirium, convulsions and great pain. Although
it may take several months, most people do recover from a Lionfish
sting.

Lionfish inhabit coral reefs, especially
shallow water areas, and are among the most beautiful coral reef fish
found.